<template>
    <div class="helper">
        <span class="left">{{unFinishedTodoLength}} items left</span>
        <span class="tabs">
      <span
              v-for="state in states"
              :key="state"
              :class="[state, filter === state ? 'actived' : '']"
              @click="toggleFilter(state)"
      >
        {{state}}
      </span>
    </span>
        <span class="clear" @click="clearAllCompleted">Clear Completed</span>
    </div>
</template>

<script>
    export default {
        props: {
            filter: {
                type: String,
                required: true
            },
            todos: {
                type: Array,
                required: true
            }
        },
        data () {
            return {
                states: ['all', 'active', 'completed']
            }
        },
        computed: {
            unFinishedTodoLength () {
                return this.todos.filter(todo => !todo.completed).length
            }
        },
        methods: {
            clearAllCompleted () {
                this.$emit('clearAllCompleted')
            },
            toggleFilter (state) {
                this.$emit('toggle', state)
            }
        }
    }
</script>

<style type="text/stylus" scoped>
    .helper {
        font-weight 100
        display flex
        justify-content space-between
        padding 5px 0
        line-height 30px
        background-color #fff
        font-size 14px
        font-smoothing: antialiased
    }

    .left, .clear, .tabs {
        padding 0 10px
        box-sizing border-box
    }

    .left, .clear {
        width 150px
    }

    .left {
        text-align left
    }

    .clear {
        text-align right
        cursor pointer
    }

    .tabs {
        width 200px
        display flex
        justify-content space-around
        * {
            display inline-block
            padding 0 10px
            cursor pointer
            border 1px solid rgba(175, 47, 47, 0)
            &.actived {
                border-color rgba(175, 47, 47, 0.4)
                border-radius 5px
            }
        }
    }
</style>


